Abstract: As the most promising alternatives of high-performance hot melt adhesive matrix resin,the products and technologies of amorphous poly-α-olefin suffered from long term foreign monopoly,which was mainly because of the lack of the systematic cognition to the relationship between molecular chain structure and performance.In this paper,the structure and properties of representative APAO products from domestic and abroad were studied systematically.The results indicated that,compared with the domestic low-end products,foreign high quality products had higher molecular weight,higher propylene content and appropriate ethylene sequence distribution,so forming thicker lamella,and then resulting in better thermal stability and high temperature fluidity.Therefore,we can develop excellent APAO products by increasing propylene content and adjusting chain sequence distribution.